c251_13 - Magnetic Materials Magnetization Vector In the...

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1 1 Magnetic Materials • In the absence of an applied magnetic field, the magnetic dipoles in most materials are randomly oriented, giving a net macroscopic magnetization of zero. • When an external magnetic field is applied, the magnetic dipoles have a tendency to align themselves with the applied magnetic field. Magnetized Materials A material is said to be magnetized when induced magnetic dipoles are present. The presence of the induced magnetic dipoles modifies the magnetic field both inside and outside of the magnetized material. Permanent Magnets Most materials lose their magnetization when the external magnetic field is removed. A material that remains magnetized in the absence of an applied magnetic field is called a permanent magnet . 2 moment dipole magnetic is m & volume unit per dipoles of # N , r r r = = m N M Magnetization Vector The magnetization or net magnetic dipole moment per unit volume is given by m r 3 Permeability Concept • For some materials, the magnetization is proportional to the H field tibility suscep magnetic m = = χ H M m r r H H ) 1 ( ) M H ( B m o o r r r r r μ = + = + = μ
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This note was uploaded on 07/11/2011 for the course ELEC 251 taught by Professor Lynch during the Spring '10 term at Concordia Canada.

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c251_13 - Magnetic Materials Magnetization Vector In the...

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